--- a/rpcgen/rpc_main.c
+++ b/rpcgen/rpc_main.c
@@ -89,7 +89,7 @@ static const char *cmdname;
 
 static const char *svcclosetime = "120";
 static int cppDefined;	/* explicit path for C preprocessor */
-static const char *CPP = "/lib/cpp";
+static const char *CPP = "/usr/bin/clang-cpp";
 static const char CPPFLAGS[] = "-C";
 static char *pathbuf;
 static int cpp_pid;
